Q&A with Mark Sirangelo, leader of Sierra Nevada Space Systems

A Northrop Grumman Antares rocket, upgraded to carry heavier payloads into orbit, lifted off Saturday from a launch pad on Virginia’s Eastern Shore with a Cygnus supply ship in pursuit of the International Space Station with fresh food, a collection of biological and technology demonstration experiments, a zero-g baking oven, and repair gear for an aging $2 billion particle physics experiment.

Watch the launch of a commercial Falcon 9 rocket carrying a Dragon cargo ship bound for the International Space Station, as seen live on NASA Television.

Frank Culbertson, a former shuttle and station astronaut and now head of Orbital ATK’s space systems group, spoke with Spaceflight Now’s Stephen Clark on the sidelines of the 2015 International Symposium for Personal and Commercial Spaceflight.